Change all sources associated with changed files (issue 22680)

pkg/analyzer/test/src/task/driver_test.dart

Index: pkg/analyzer/test/src/task/driver_test.dart
diff --git a/pkg/analyzer/test/src/task/driver_test.dart b/pkg/analyzer/test/src/task/driver_test.dart
index 9a7afd9e1f8478f0a96b1a8d56ff1801923f2356..f82d32733652514f490eee6612533d3885f95cc0 100644
--- a/pkg/analyzer/test/src/task/driver_test.dart
+++ b/pkg/analyzer/test/src/task/driver_test.dart
@@ -709,6 +709,11 @@ class _TestContext implements ExtendedAnalysisContext {
   }
 
   @override
+  List<Source> getSourcesWithFullName(String path) {
+    return baseContext.getSourcesWithFullName(path);
+  }
+
+  @override
   bool handleContentsChanged(
       Source source, String originalContents, String newContents, bool notify) {
     return baseContext.handleContentsChanged(